witnesses say the gunman, 23-year-old paul anthony ciancia, killed 39-year-old gerardo hernandez. the first tsa officer killed in the line of duty in the agency's history. two additional agents were wounded. joining me from austin, texas, is the chairman of the house homeland security committee, michael mccall. congressman, thank you very much for joining us. i think in the aftermath of this, the question i hear most often is, why did he do this. what do you know about that? i know you've been able to see some of the notes he wrote. what do you think the motivation was here? >> i think mental illness again, like the navy yard shooter that we saw. the suicide note i read talks a lot about killing tsa agents. he said, "if i just kill one, my mission is accomplished." and unfortunately, he did do that the other day. the other thing he wanted to talk about is how easy it is to bring a gun into an airport and do something like he did. my sympathies go out to the hernandez family and the other victims. this tragic day -- as you mentioned, he's the first tsa agent, officer to be killed i